Dado-clamp



(No Model.)

J. T. FRAZIER. DAI JO GLAMP.

Patented Feb. 12, 1895.

O/ILTE 7337" wmua - IUNITE I STATES {PATENT Orr-res.

JOHN T. FRAZ'IER, or SAVANNAPLMI'SS'OURI.

DADO-C'LAM P.

srEcImcA'rIoiv forming, part of Letters Patent No. 533,881, dated February 12', 1895.

Application filed J'uly23,1894. erialNo15l8,358- (Remodel) i .72? 61/55 whom, it may concerm I Be it known that I, JOHN T. FRAZIER, a citizen of the United States, residing at Savannah, in thecounty of Andrew and State of Missouri, have invented certain new and useful Improvements in Dado-Clamps; and I do hereby declare the following to be a full, clear, and exact descriptionof the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The purpose of .the invention is to lessen the labor and facilitate the dadoing of window and door jambs, and at the same time secure uniformity of length and exact register of the dadoes of complementary jambs without the necessity of measuring and securing a guide to each jamb.

Withthese and such other objects as result from the nature of the invention the latter properly consists of a gageor guide composed of hinged sections, each section having one or more retaining spurs'on its inner face to temporarily secure the jamb to be dadoed. To increase the capacity of the device and adapt it for use with lumber of various thicknesses removable fillingpieces are provided and constructed to be retained in place against accidental displacement. For efficient service the gages or guides will be provided in pairs or sets of two, located at proper distances apart, and secured to a bench or other support.

For a full understanding of the inventionre'ference is to be had, to the annexed drawings, in connection with the following description. 1 a

Figure 1 is a perspective View of a work bench showing the application of the invention. Fig. 2 is a detail view of a gage or guide, the upper section being thrown back and the filling piece slightly elevated. Fig.3 is ade-. tail view-of the catch ends of the sections.

The lower section A comprises a bar 2 hav-"' I in g standards 3 and 4: at its opposite ends extending-in the same direction in parallel relation. .Openings 0. are provided, in the bar to receive screws by means of which the device is secured to a work bench or other support. One of the openings is centrally disposed to form a bearing for the gage to turn upon, when changing its angle to a given line, -to obtainthe required angle of dado for the sub-sill. This will be more fully set forth hereinafter. Spurs 5 project up from the bar to penetrate the timber and hold the same in place. The upper section B is a bar hinged atone end to the standard 3 and having a catch 6 at its opposite end to interlock with the standard 4 and retain the section closed; The catch 6 is spring actuated and mounted in a projecting part of thesection B. A projection -7 on the standard 4 enters a recess in this section B and holds the latter from lateral displacement. One-or more spurs b extend from the inner side of the section B and cooperate with the spurs 5 to secure the timber in place when operated upon. The

filling piece 0 is a bar having its ends notched to receive thestandards by means of which it is held in place, and has openings 8 to receive the spurs 5 and admit of the bar lying close upon the horizontal portion of the-sec: tion AI Spurs 9 are provided on the filling piece to answer the same purpose as the spurs 5-on the section A.

'In the operation of the invention two gages or guides of substantially the same construction herein specified, are provided and attached to a work bench D, or other support, the one E so that it will occur at right angles to the edge or a given line of the bench, the other E at a slight angle to the said edge or line to correspond with the pitch of the sub-sill. two gages E and E will be set the proper distance apart to correspond with the position .middle screw and turning the gage on the said middle screw as a pivot. After the proper adjustment is effected the gage E is. tightened and the operation of dadoing can he proceeded with. The edges of the top section form guides for the cutting tool. Hence the dadoes are always the same distance apart.

The

Having thus described the invention, a hat is claimed as new is- In combination with a table or support, of a pair of gages or guides attached and secured thereto by means of screws passing through the same, one of the latter being centrally disposed in order that the said gage may be adjusted on its pivot, said gages or guides being composed of two sections hinged together at one end, the lower section being formed with uprights at its ends, one of said uprights having a projection fitting a recess in the hinged upper section to prevent lateral displacement thereof and a spring catch for securing the upper section to the lower, 5

specification in the presence of two subscrib- 2c ing witnesses.

JOHN T. FRAZIER.

Witnesses:

R. O. WATERS, R. H. SKUsE. 

